Research question 1:

Research question 1: What is the best recipe for bubble soap?

Not every soap mixture is suitable for making bubbles. On the internet you will find a lot of recipes. Most of them have water and soap as main ingredients.

The research question is:

- What is the best ratio between water and soap?

Follow the scientific method to get to the best recipe.

1. Research question: The first question is "what is the best ratio between water and soap?"
2. Observation: find at least 6 different recipes for soap bubbles on the internet.

If you find recipes with other ingredients next to water and soap, only write down the amounts of water and soap.

Use the unit ml:

1 cup = 237 ml

1 tablespoon = 15 ml

1 teaspoon = 5 ml

Compare the water and soap in every recipe to see the ratio between soap and water.

Put all your infomation of your pre research in this table:

3. Hypothesis: Write down your hypothesis. (If....then.....)

4. Experiment:

• What will be your independent variable?
• What will be your dependent variable?
• What will you keep constant?
• Don't forget to think about how you will measure what is the best soap.
• Test a minimum of 4 different soap/water mixtures.
• Write down your method in detail. You can download the investigation worksheet at the bottom of this page
• material you can use for your experiment:
  • plastic cups (to make your mixture in)
  • water and soap
  • Plastic plates (to blow your bubbles into)
  • drinking straws (to blow your bubbles)

5. Collect and analyse your results: If your teacher has approved the set up of your experiment you can start. Make a table to collect your results.

6. Conclusions: Look at your results. Was your hypothesis right? What is the answer to your research question?

7. Write a research report about this experiment